﻿/******************************************************************************
 * Copyright (C) 2015  671643387@qq.com
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 *****************************************************************************/

#ifndef SHARED_BASE_MUTEX_WIN32_H_
#define SHARED_BASE_MUTEX_WIN32_H_

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif

#define WIN32_LEAN_AND_MEAN
#include <Windows.h>


namespace Shared {

    class MutexImpl
    {
    protected:
        MutexImpl(void)
            : _locked(false)
        {
            InitializeCriticalSectionAndSpinCount(&_cs, 4000);
        }

        ~MutexImpl(void)
        {
            DeleteCriticalSection(&_cs);
        }

        bool lockImpl(void)
        {
            EnterCriticalSection(&_cs);
            _locked = true;
            return true;
        }

        bool tryLockImpl(void)
        {
            if (TryEnterCriticalSection(&_cs)) {
                _locked = true;
                return true;
            }
            return false;
        }

        void unlockImpl(void)
        {
            _locked = false;
            LeaveCriticalSection(&_cs);
        }

        bool lockedImpl(void) const {
            return _locked;
        }

    private:
        volatile bool _locked;
        CRITICAL_SECTION _cs;
    };

}

#endif // SHARED_BASE_MUTEX_WIN32_H_
